2017 Toyota Highlander: engine knocking or ticking

Filed Sep 11, 2025 · Electrical, Engine · IN

Formal Complaint to the federal safety agency – Summary I am submitting this formal complaint regarding repeated mechanical and electrical failures involving my 2017 Toyota Highlander, purchased as a Toyota Gold-Certified vehicle with an extended Platinum Warranty. Despite strictly following Toyota’s maintenance guidelines and using only certified dealerships for all services, the vehicle has become inoperable multiple times, requiring five separate tows and resulting in repair costs exceeding $10,000. In June 2025, a Toyota dealership replaced the engine after diagnosing a warped head due to water pump failure. Following this, the vehicle began experiencing repeated charging system failures and electrical malfunctions. Multiple components—including the alternator, battery, and sensors—were replaced at another Toyota dealership based on ongoing issues, but the problems persisted. On September 2, 2025, a Toyota technician identified a missing ground wire nut as the likely root cause of these electrical failures. He confirmed the issue originated during the engine installation and that the unsecured ground caused system malfunctions. After repairs, the vehicle was again returned with a loud engine knocking noise, later traced to an improperly secured component from a prior repair. These events have raised significant concerns for the safety of myself and my family. Improper installation of major components and misdiagnosis by certified service providers have led to hazardous driving conditions, unexpected vehicle shutdowns, and unnecessary costs. I am requesting that the federal safety agency investigate this matter for potential safety defects related to improper engine installation, grounding failures, and faulty electrical diagnosis by certified Toyota service centers. Documentation, invoices, and repair records are available upon request. Thank you for your attention to this critical safety issue.

Filed Aug 27, 2025 · Fuel system · UT

Today (8/26/2025) my wife experienced the engine light kicked on and that the AWD system needed to be checked. After fueling up it made knocking noises and difficulty starting, and took two times to start up. Ran an OBD scan and this is what it says, which is related to fuel pump low pressure. P117B - Fuel Pressure Sensor Circuit Range/Performance Severity - High Description - Indicates a problem with the fuel pressure sensor circuit, where the sensor's output signal is outside the expected range or performance criteria, leading to potential issues with fuel delivery or engine performance. P0174 - System Too Lean (Bank 2) Severity - High Description - Your engine is getting too much air and/or not enough fuel, this is known as a "Lean" condition. Excess oxygen is getting into your engine, which makes the combustion process less efficient. This could be caused by many different factors. Consequences of Continued Driving - Reduced power, Engine knocking, Rough idle

Filed Aug 19, 2024 · Transmission · 70,000 miles · CT · 2 injuries

The contact owns a 2017 Toyota Highlander. The contact stated that the vehicle was parked but still running in a driveway on an incline. After exiting the vehicle, there were abnormal beeping and ticking noises detected, and the vehicle began to roll down the street. The contact and daughter were pinned between the door and the vehicle. The contact's daughter sustained injuries to her chin and teeth. The driver has lumps and bruises on her leg and back pain, but medical attention was not provided. The rear wheels were on the curb and hit a trash can, and the vehicle stopped rolling. The local dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was not contacted. The failure mileage was approximately 70,000.

Filed Mar 30, 2023 · Fuel system · VA

My fuel pump has started going out causing my engine to slightly knock and my fuel gauge and range to read improperly

Filed Nov 18, 2022 · Engine · NC

This is the second major failure I have experienced with my 2017 Toyota Highlander. I have already filed a complaint about the transmission failure earlier this year. On November 14, 2022, I noticed a knocking sound coming from the engine. My husband was able to ascertain that the noise was coming from the water pump and that the water pump gasket had failed. He checked the coolant fluid and all coolant fluid had leaked out, both the reserve tank and radiator had NO coolant fluid remaining. If I had continued to drive the vehicle, it would have overheated and possibly caused more damage. Thanks to the cooler temperatures we have in November, I did not experience the engine overheating. There were no warning lights or any other indicator that something major was wrong with the vehicle. We called our Toyota dealership and were told that the vehicle which now has 50,100 miles, is out of warranty and we would be responsible for the repair. The normal life of a water pump is over 100,000 miles and with this complete failure of this major system, I do not trust the safety of this vehicle with this being the second major system to completely fail in this vehicle.

Filed Jul 30, 2018 · Engine · 13,000 miles · PA

In motion, there was no indicator light on board, just big noise started coming during start or speed of car. Engine cyl 6 rod bearing was faulty , making noise, dealer repaired it and not able to assure other bearings dont have any issues.